... production of special screwsB, screw diameter:¢ 90mm, screw L/D:20:1, screw materials and processing technology:CMnALA,nitrided ... quenched Nitriding depth: ≥ 0.6 mm nitride hardness ≥ HV800 D, processing: quenching nitriding nitriding depth: ≥ 0.7 mm Nitride ... appliances: Chint C, temperature-controlled table: Japanese Omron D, 18.5KW Motor: Siemens E, frequency: AMBF, powder dust dedicated cabinet ...